Struts question: how do you handle an undefined ActionForward value?

[steve.gutter@xxxxxxxxxx]

Granted that it shouldn't happen, but how do you handle the circumstance
when the ActionModel class's
execute method returns an ActionForward value which is not defined as a
forward name= value
in the ActionModel's action definition in struts-config.xml?


It causes the app to go to a blank page, but no exceptions, etc. are
thrown.

I'm using the action entry with unknown="true" for the case where I have an
href="xyz.do" and there is no
action defined for /xyz (which, again, granted shouldn't happen), but this
doesn't catch the other scenario.